You want tough, BrazillianGuy? I'll give you tough. You're going with a Yanma as your Gen 2 Pokemon.
Now, you may say that Yanma isn't that bad. While you said that every Pokemon must be able to become fully evolved, you'll be going to hell and back to get it that way.
Now, your Yanma's restrictions will vary depending on it's Ability.
If it's ability is CompoundEyes, it's name will be ICU, and it must abuse CompoundEyes by hitting every Pokemon it fights with Supersonic (or later, Hypnosis) before it attacks. If the opponent wakes up or snaps out of confusion, you must put them back to sleep or confuse them again. Once it evolves into a Yanmega, it's ability will change to Tinted Lens, and at that point, it is only allowed to attack when it's move hits for super effective damage. What's more, it can only use STAB moves to attack.
If it's ability is Speed Boost, it's nickname will be Cacophony, and it may only learn moves that are blocked by Soundproof. Once it evolves, it realizes what a stupid restriction that was, and may never learn a sound-based move. Instead, it will only learn Physical attacking moves, and the only Bug-type move it can learn is U-turn. It may only attack with STAB moves.
To top it off, if any of it's moves have their secondary effect activate (e.g. Air Slash's flinch) it must switch out immediately. It may also only heal it's HP with Roost (once you get the TM on Route 210), though it may heal at each Pokemon Center once. To evolve, of course it must learn AncientPower, but it can never use it in battle. Instead, it has to solo 20 trainer-owned Pokemon that are capable of learning AncientPower in order to evolve. It also may never have a hold item
Now, as for it's solos, the super-effective STAB only restriction is lifted(though it still may only use STAB, based on the ability) it must solo Flint, and it must OHKO his Houndoom. It must also solo Candice, OHKOing her Froslass. Also, just for fun, have it solo Cyrus' Flying types at the fight in the Distortion World (STAB Super Effective restriction also removed for that fight).
So, I think that's pretty difficult. Good luck, have fun!
Last edited by Tyranitarphantom; Sep 19th, 2011 at 4:15:27 PM.